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Journal of the Nigerian Association of Mathematical Physics最新文献

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Groundwater potential investigation using combined VLF and VES 利用VLF和VES联合进行地下水潜力调查
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40235
K. Ozegin, D. Isiwele, S. Azi
{"title":"Groundwater potential investigation using combined VLF and VES","authors":"K. Ozegin, D. Isiwele, S. Azi","doi":"10.4314/JONAMP.V11I1.40235","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40235","url":null,"abstract":"This work is an assessment of groundwater in Oke-Agbe High School field located in Akoko North-West Local Government Area of Ondo State. The goal is to establish groundwater viability in this location based on a clear-cut relationship between Electrical Resistivity (VES) and Electromagnetics methods (VLF). Both methods were jointly used for investigation to determine overburden thickness, geo-electric layers and groundwater potential.The advantage of this combination is that the VLF technique was used as a reconnaissance survey to identify the best VES locations. The computer iterated data from the study area enabled us to delineate the area into high, medium and low water potential zones Results obtained in this study clearly showed the depth to the bedrock beneath the VES stations. The field was contoured to demarcate areas with thick overburden ( 10m), areas with medium overburden (between 5-8 m) and areas with relatively thin overburden (≤ 5m) marked as A, B, and C respectively. VES station 4 with infinite overburden thickness and VES station 6 with fractured basement are the only aquifer units within the entire school field where groundwater could be exploited and therefore, serve as high groundwater potential zones. However, it must be stated here that VES station 6 is the surest bet within the priority area for groundwater development. . This result from combined technique is more reliable than the investigation based on only one method of investigation for groundwater feasibility studies, especially were the subsurface is doubtful. JONAMP Vol. 11 2007: pp. 403-410","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131167226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Heat and mass transfer in the unsteady hydromagnetic free-convection flow in a rotating binary fluid I 旋转二元流体中非定常磁流体自由对流中的传热传质
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40256
M. Alabraba, O. Aghoghophia, K. D. Alagoa
{"title":"Heat and mass transfer in the unsteady hydromagnetic free-convection flow in a rotating binary fluid I","authors":"M. Alabraba, O. Aghoghophia, K. D. Alagoa","doi":"10.4314/JONAMP.V11I1.40256","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40256","url":null,"abstract":"The paper studies the unsteady free-convection flow near a moving infinite flat plate in a rotating binary mixture of an incompressible fluid. Both Soret (thermal diffusion), Dufour (diffusion-thermo) and radiation effects are considered when there is no chemical reaction. By imposing a time dependent perturbation on the constant plate temperature and concentration and assuming a differential approximation for the radiative flux, the coupled non linear problem is solved for the temperature and the concentration. First a critical value for the Soret was determined as 0.10 and the effects of Dufour, Soret and radiation show that while both Dufour and Soret have no effect on the temperature field, they both affect the concentration field with the Dufour causing an overwhelming increase and the Soret just a slight decrease. Furthermore radiation decreases both the temperature and concentration field. JONAMP Vol. 11 2007: pp. 533-543","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"2011 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132962989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Manpower Planning Model for Less Developed Countries 欠发达国家人力资源规划模式
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40246
A. Osagiede, V. Ekhosuehi
{"title":"Manpower Planning Model for Less Developed Countries","authors":"A. Osagiede, V. Ekhosuehi","doi":"10.4314/JONAMP.V11I1.40246","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40246","url":null,"abstract":"The need for manpower planning in underdeveloped countries is necessary to remove widespread unemployment and disguised unemployment in such economies. Models for predicting future manpower requirements are indispensable tools for planners and policy makers. A model which captures manpower demand and supply is developed in this study to predict future manpower structure in less developed countries (LDCs). In addition a partial adjustment to manpower planning model is proposed to off set the lag that may be present in manpower system. JONAMP Vol. 11 2007: pp. 485-490","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133344846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Constructing an automorphism with discrete spectrum 构造具有离散谱的自同构
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40247
A. Isere, J. Osemwenkhae
{"title":"Constructing an automorphism with discrete spectrum","authors":"A. Isere, J. Osemwenkhae","doi":"10.4314/JONAMP.V11I1.40247","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40247","url":null,"abstract":"This work is a desire to construct an automorphism with discrete spectrum using a numerical example. We briefly discuss how some of the definitions and theorems about its behaviour can be implemented and verified numerically. While it is not intended as a complete introduction to measure theory, only the definitions relevant to the discussion in this work are included. It went further to show that a necessary and sufficient condition for a measure-preserving transformation c on a unit circle S' to be invertible is that it must both be one-one and onto and concludes that it is an automorphism if the real number, α , is one. JONAMP Vol. 11 2007: pp. 491-496","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134216103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Hamilton-Jacobi-Bellman equations for quantum control 量子控制的Hamilton-Jacobi-Bellman方程
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40254
M. Ogundiran, P. Olanrewaju
{"title":"Hamilton-Jacobi-Bellman equations for quantum control","authors":"M. Ogundiran, P. Olanrewaju","doi":"10.4314/JONAMP.V11I1.40254","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40254","url":null,"abstract":"The aim of this work is to study Hamilton-Jacobi-Bellman equation for quantum control driven by quantum noises. These noises are annhihilation, creation and gauge processes. We shall consider the solutions of Hamilton-Jacobi-Bellman equation via the Hamiltonian system measurable in time. JONAMP Vol. 11 2007: pp. 525-528","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130151759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Capacity and coverage of power controlled CDMA cellular systems 功率控制CDMA蜂窝系统的容量和覆盖范围
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40264
J. Isabona, B. Asuquo, M. Ekpenyong
{"title":"Capacity and coverage of power controlled CDMA cellular systems","authors":"J. Isabona, B. Asuquo, M. Ekpenyong","doi":"10.4314/JONAMP.V11I1.40264","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40264","url":null,"abstract":"Coverage and capacity are among the ambitious challenges to be met by the third generation (3G) systems for successful deployment of its services to both residential and commercial subscribers. This paper reports on the performance study of CDMA systems in relation to an optimum step-regulated SNR-based transmitted power. We derive the system model and present a computer simulation to optimize the transmitted power for each user and maintain the required λb N 0 (signal-to-noise ratio) for satisfactory call quality by achieving a minimal λb N 0 for every user with an acceptable channel performance. We observe from the simulation that SNR based power control with updating step-size of 0.8dB provides acceptable system availability and stability. JONAMP Vol. 11 2007: pp. 605-614","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131426473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Probabilistic dynamic stability of a damped spherical shell pressurized by a random load
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40225
A. Ette
{"title":"Probabilistic dynamic stability of a damped spherical shell pressurized by a random load","authors":"A. Ette","doi":"10.4314/JONAMP.V11I1.40225","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40225","url":null,"abstract":"This investigation examines the dynamic stability of a damped imperfect spherical shell within the precinct of a random dynamic load applied just after the initial time. The statistical characterizations of the random load ,such as the mean and the autocorrelation , are assumed given and non-vanishing .In particular, the autocorrelation of the random dynamic load is a stationary noise that is correlated as an exponentially decaying harmonic function of time . Such stochastic and random characterizations of the dynamic load function confer some element of randomness on the normal displacement whose statistical mean we shall first seek for the determination of the dynamic buckling load . Lastly, the dynamic buckling load is determined via a suitable maximization and certain useful deductions are made . Assuming that the variance of the random load is and using the mean normal displacement as a relevant statistical characterization of the response, it is observed that the dynamic buckling load is of order R 0 -1 , that is O( 1 R 0 ), of the load variance R 0 JONAMP Vol. 11 2007: pp. 311-322","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"198 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122361761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the impact of wave-current on Stokes waves 论波流对斯托克斯波的影响
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-06-13 DOI: 10.4314/JONAMP.V11I1.40229
B. Oyetunde, E. Okeke
{"title":"On the impact of wave-current on Stokes waves","authors":"B. Oyetunde, E. Okeke","doi":"10.4314/JONAMP.V11I1.40229","DOIUrl":"https://doi.org/10.4314/JONAMP.V11I1.40229","url":null,"abstract":"This study considers the impact of wave - current on Stokes waves in deep water. Using separately, the third, fourth and fifth order approximations of wave profile functions respectively and the determined expressions for wave – current speed , it is shown that the wave - current speed is more intense on the surface of the ocean, but however, the intensity reduces exponentially downwards with the depth. The present analysis also suggests that the wave – current speed increases with increase in wave steepness. It is further deduced that the wave- current speed is the same in magnitude for both fourth and fifth order; thus, showing the convergence of solutions concerning wave - current speed in Stokes waves as the order increases. JONAMP Vol. 11 2007: pp. 363-368","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124730963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Theoretical model analysis of molecular orientations in liquid protein dielectrics 液体蛋白电介质分子取向的理论模型分析
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-05-22 DOI: 10.4314/JONAMP.V10I1.40100
A. Laogun, N. Ajayi
{"title":"Theoretical model analysis of molecular orientations in liquid protein dielectrics","authors":"A. Laogun, N. Ajayi","doi":"10.4314/JONAMP.V10I1.40100","DOIUrl":"https://doi.org/10.4314/JONAMP.V10I1.40100","url":null,"abstract":"In this study, some theoretical model functions have been used to explain the molecular behaviour of four different types of proteins; human haemoglobin, Insulin, egg-white lysozyme and β - globulin molecules in solution. The results of the computational fitting procedures showed that the dielectric dispersion of the protein molecules generally followed the Debye and Cole-Cole functions. The dielectric parameters obtained from the dispersions, relating to the structural and electrical properties of the molecules were tabulated. The relationships between the dispersion amplitude Δ and the molecular dipole moment μ of the proteins and also between the relaxation time τ and the energy of activation ΔH of the molecules have been highlighted. The molecular interpretation of the polarization effects responsible for the dielectric dispersions have been discussed. Journal of the Nigerian Association of Mathematical Physics Vol. 10 2006: pp. 15-20","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125549844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Perturbed segmented domain collocation Tau-method for the numerical solution of Second Order Boundary Value problems 二阶边值问题数值解的扰动分割域配置tau法
Journal of the Nigerian Association of Mathematical Physics Pub Date : 2008-05-22 DOI: 10.4314/JONAMP.V10I1.40137
O. A. Taiwo, A. Olagunju
{"title":"Perturbed segmented domain collocation Tau-method for the numerical solution of Second Order Boundary Value problems","authors":"O. A. Taiwo, A. Olagunju","doi":"10.4314/JONAMP.V10I1.40137","DOIUrl":"https://doi.org/10.4314/JONAMP.V10I1.40137","url":null,"abstract":"This paper concerns the numerical solution of second order boundary value problems using a Perturbed segmented domain collocation-Tau method. The entire interval for which the problem is defined is partitioned into two segments and the solution technique is demonstrated on each of the segments. The Chebyshev polynomials shifted as the case may be, into a given interval are used as a basis for a collocation solution via the perturbed collocation method for each segment. For a given problem two different solutions are obtained, which are valid for different intervals within the domain. Numerical examples are given to illustrate the efficiency, accuracy and computational cost of the method. Journal of the Nigerian Association of Mathematical Physics Vol. 10 2006: pp. 293-298","PeriodicalId":402697,"journal":{"name":"Journal of the Nigerian Association of Mathematical Physics","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116196533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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